Inductance device



Feb. 4, 1941. PETERSQN 2,230,364

INDUCTANCE DEVICE Original Filed May 7,1936

222 w Iii/Li ul um FIG? INVEN 70/? G. PETERSON y ma 21 A T TORNE V Patented Feb. 4, 1941 g UNITED STATES PATENT (ow INDUCTANCE DEVICE Glen Peterson, Pasadena, Calif., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Original application May 7, 1936, Serial No. 78,365. Divided and this application July 26, 1939, Serial No. 286,515

11 Claims. (Cl. 175359) This invention relates to radio apparatus and remain the same and that each part that is particularly to inductance devices suitable for homogeneous maintains its volume symmetry. use as circuit elements in radio frequency sys- With such construction substantially no stresses tems such as oscillator systems, for example. in or slippage between the component parts are This application is a division of my copending introduced when the temperature changes.

application for Reactance devices, Serial No. For a clearer understanding of the nature of 78,365, filed May 7, 1936, now U. S. Patent 2,185,- this invention and the additional features and 355, dated January 2, 1940. objects thereof, reference is made to the follow- One of the objects of this invention is to stabiing description taken in connection with the aclize the electrical impedance characteristics of companying drawing, in which like reference inductance devices. characters indicate like or similar parts and in Temperature variations, mechanical vibrations, which:

and other changes influence the frequency sta- Figs. 1 and 2 areside and end views, respecbility of radio apparatus. Temperature changes tively, of an inductance device embodying this may cause expansion and contraction of the sevinvention. 15 eral parts of the apparatus and corresponding Referring to the drawing, Figs. 1 and 2 illuschanges in the inductance and capacity thereof trate an inductance device having stable in with resulting frequency variations. Vibrations ductance characteristics. An inductance elemay shake the parts, likewise changing the inment comprising a solenoidal coil 220 constructed so ductance and capacity of the system and of the of copper conductor such as quarter inch diam- 0 component parts thereof. eter hollow copper tubing of suitable dimensions To control the effects of vibration upon the freand a suitable number of equal diameter turns quency stability, the several parts may be so is supported from a flat plate 222 of the same intimately fastened together as to cause the asmaterial, namely copper, by a suitable number of sembly to respond as a single unit. To provide equal length insulating pillars 224, 226, 228, 230 for attenuation of vibration where the vibration and 232 of hard rubber or preferably quartz or comes from a source exterior to the apparatus Isolantite or other suitable dielectric, preferitself, a vibration attenuating mounting medium ably relatively free of cold flow and aging qualisuch as one or more sponge rubber mats may be ties. Small prongs 234, 236, 238, 240 and 242 of interposed between the source of vibration and copper or other suitable material and of equal the apparatus to prevent conduction of and to length may be suitably fastened as by screw damp out vibrations. threads, for example, to the insulating pillars 224,

To control the effect of temperature change 226, 228, 230 and 232, respectively. The extreme upon the frequency stability of the system, the inbottom portions of the turns of the copper tubing ductance devices in circuit therewith may each 220 are suitably fastened as by soldering, for exbe constructed in such manner that the appaample, to the vertical prongs 234, 236, 238, 240 35 Tatus returns to its original dimensions at a given and 242. The insulating pillars 224, 226, 228, 230 temperature after being heated or cooled and, and 232 are fastened to the copper plate222 by therefore, has a constant electrical impedance suitable means such as copper screws 254, 256, o characteristic at a given value of temperature. 258, 260 and 262,respectively.

For this purpose, the apparatus may have com- While the coil 220 and the plate 222 are prefponent insulating and metallic parts composed of erably wholly constructed of copper of the same such materials and so disposed or interconnected temperature coefficient of expansion, it will be with reference to temperature coefficients of exunderstood that other suitable material such as a pansion of the parts as to permit free expansion aluminum may be utilized to provide the same and contraction thereof in all directions without over-all expansion as measured between ends producing stresses therein or slippage therebeconnected by any two of the transverse parallel tween. Such construction contemplates that the members 224, 226,228, 230 and 232. expansion along any one axis be the same as that The coil 220 soconstructed and mounted is along any other equal length axis parallel therefree to expand and contract in every direction. to, that members connected by transverse paral- The length and also the diameter of the coil 220 le1 members shall have the same over-all temis wholly determined by copper. The spacing perature coefiicients of expansion measured axibetween the coil 220 and the plate 222 is wholly ally between their ends, that before and after a determined by the supporting members there- 5 temperature change all angles between the parts between, each having the same over-all temperature coefiicient of expansion. Accordingly, all of the parts are so connected with respect to each other that when the temperature changes, no stresses are introduced into the component parts, no frictional slippage is introduced between the component parts, all angles between all of the component parts remain the same before and after a temperature change, each part that is hlomogeneous maintains its volume symmetry, and any two members connected by transverse parallel members have the same over-all temperature coeincients of expansion as measured between their ends whereby the expansion along any one axis is the same as that along any other equal length axis parallel thereto.

Another copper coil 210, similar to the coil 220, may, if desired, be inductively coupled with the coil 22!! by disposing the turns of the coil 2'") in spaced relation between those of the coil 22!] and supporting the turns of coil 21!] from the copper plate 222 by equal length insulating pillars 212, 274, 216 and 278, by screws 280, 282, 284 and 286, and by screws 288, 290, 292 and 294 in the same manner as the coil 220 is supported.

Although this invention has been described and illustrated in relation to specific arrangements, it is to be understood that it is capable of application in other organizations and is, therefore, not to be limited to the particular embodiments disclosed, but only by the scope of the appended claims and the state of the prior art,

What is claimed is:

1. An inductance device including an inductance coil, at least some of the turns of said coil having substantially coaligned' surfaces, a supporting plate having a surface disposed substantially parallel to said coaligned surfaces, and substantiallly equal length and parallel insulating pillars disposed between and secured to said coaligned surfaces and said surface of said supporting plate, said coil and said supporting plate being composed of the same metallic material having substantially the same temperature coefficient of expansion, and said insulating pillars having substantially equal over-all temperature coeflicients of expansion along said equal length dimensions thereof.

2. An inductance device including an inductance coil, a support, said coil and said support being of substantially the same metallic composition having substantially the same temperature coefilcient of expansion, and means including a plurality of insulating members securely connected to said coil and said support and having substantially equal over-all temperature coefficients of expansion as measured between the points of connection to said coil and support.

3. An inductance device including an inductance coil, a support, said coil and said support being composed of the same metallic material having substantially the same temperature co,- eliicient of expansion, and means including a plurality of insulating members each individually connected to substantially one point only of said coil and said support and all having substantially equal over-all temperature coefiicients of expansion as measured between the points of connection to said coil and support.

4. An inductance device including an inductance coil having self-supporting inductance turns, a support, said coil and said support being composed of metallic material having substantially the same temperature coefficient of expansion, and means including a plurality of insulating members each connected to substantially one point only of said coil and said support and all having substantially equal over-all temperature coeflicients of expansion as measured between the points of connection to said coil and support, said members being axially substantially parallel with respect to each other.

5. An inductance device including an inductance coil, a support, said coil and said support being composed of metallic material having substantially the same temperature coefficient of expansion, and means including a plurality of insulating members connected to said coil and said support, and having substantially equal over-all temperature coefficients of expansion as measured between the points of connection to said coil and support, said members being axially substantially parallel with respect to each other and substantially perpendicular with respect to the surfaces of said coil and support to which they are connected.

6. An inductance device including an inductance coil having self-supporting inductance turns, a support, said coil and said support being composed of metallic material having substantially the same temperature coefficient of expansion, and means including a plurality of insulating members each securely connected to substantially one point only of said turns of said coil and said support and all having substantially equal over-all temperature coefficients of expansion as measured between the points of connection to said coil and. support, all of said members being axially substantially parallel with respect to each other and disposed in substantially the same plane.

7. An inductance device including an inductance coil, a support, said coil and said support being composed of metallic material having substantially the same temperature coeflicient of expansion, and means including a plurality of insulating members connected to said coil and said support and having substantially equal overall temperature coeflicients of expansion as measured between the points of connection to said coil and support, said members being axially substantially parallel with respect to each other, axially substantially perpendicular with respect to the surfaces of said coil and support to which they are connected, and axially disposed in substantially the same plane. I

8. An inductance device including an inductance coil, a support, said coil and said support being composed of metallic copper having substantially the same temperature coefiicient of expansion, and means including a plurality of insulating members securely connected to said coil and to said support and having substantially equal over-all temperature coeificients of expansion as measured between the points of connection to said coil and support, said members being axially substantially parallel with respect to each other, substantially perpendicular with respect to the surfaces of said coil andsupp'ort to which they are connected, and disposed in substantially the same plane.

9. An inductance device including an inductance coil member having self-supporting inductance turns composed of metallic material, a support member composed of metallic material, and a plurality of transverse insulating members securely connected to and disposed between said coil and said support members for mounting said coil member from said support member, said metallic coil member and said metallic support member having substantially the same temperature coefficient of expansion, and said insulating members having substantially the same over-all temperature coefficient of expansion measured linearly between their points of connection to said coil member and said support member.

10. An inductance device including an inductance coil, a support, and a plurality of transverse insulating members each securely connected to said support and to substantially one point only of said coil and disposed between said coil and said support for mounting said coil from said support, said coil and support being composed of metallic material having substantially the same temperature coef icient of expansion.

11. An inductance device including an inductance coil element having self-supporting inductance turns, at least a part of said turns having substantially coaligned surfaces, supporting means having a surface disposed substantially parallel to said coaligned surfaces of said element, said means and said element being composed of metallic material having substantially the same temperature coefficient of expansion, and a plurality of substantially parallel insulating members each disposed between and secured to one point only of said coaligned surfaces and to said surface of said supporting means, said members being of substantially equal length and having substantially equal over-all temperature coefiicients of expansion along said equal lengths thereof as measured axially between the points of connection to said supporting means and said coaligned surfaces, said length dimension of said members being substantially perpendicular to the center line axis of said coil turns.

GLEN PETERSON. 

